当他们到达机场时,我们正在等他们 用英语怎么翻译

问题描述:

当他们到达机场时,我们正在等他们 用英语怎么翻译

We were waiting for them,when they arrived the airport.

We were waiting for them when they arrived at the airport.

we are waiting for them when they arrive at the airport

When they arrive the airport, we are waiting for them.